A5010405644- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Luminescence and Fluorescent Materials
- Quantum Dots Synthesis And Properties
- Molecular Junctions and Nanostructures
- Perovskite Materials and Applications
- Thermal and Kinetic Analysis
- Copper-based nanomaterials and applications
- Analytical Chemistry and Sensors
- Gas Sensing Nanomaterials and Sensors
- Crystallization and Solubility Studies
- Photochemistry and Electron Transfer Studies
- X-ray Diffraction in Crystallography
- ZnO doping and properties
- Green IT and Sustainability
- Chalcogenide Semiconductor Thin Films
University of Augsburg
2020-2024
Amity University
2020-2021
Thermally-activated delayed fluorescence (TADF) emitters—just like phosphorescent ones—can in principle allow for 100% internal quantum efficiency of organic light-emitting diodes (OLEDs), because the initially formed electron-hole pairs non-emissive triplet state can be efficiently converted into emissive singlets by reverse intersystem crossing. However, as compared to emitter complexes with their bulky—often close spherical—molecular structures, TADF emitters offer advantage align them...
Abstract Organic thermally activated delayed fluorescent (TADF) materials can harvest 100% of the electrically generated excitons as a result their small singlet–triplet energy difference. However, maximizing external quantum efficiency (EQE) device also requires enhancing light out‐coupling efficiency. This work presents new acceptor–donor–acceptor (ADA) emitter employing an indolocarbazole donor and diphenyltriazine acceptors that show nearly‐completely horizontal orientation regardless...
We compare how changes in the structure of an acceptor–donor–acceptor TADF emitter decorated with tert -butyl groups affect alignment. The “champion” material is ICzTRZ t Bu-substitution at distal phenyl rings triazine acceptors.
Thermally activated delayed fluorescence (TADF) compounds are highly attractive as sensitising and emitting materials for organic light-emitting diodes (OLEDs) they can harvest both singlet triplet excitons convert them into light. In this study we designed a series of derivatives the widely studied donor-acceptor TADF emitter DMAC-TRZ with objective correlating their structure to propensity orient horizontally in vacuum-deposited doped thin films. This is important preferential horizontal...
OLED device optimization often relies on time-consuming trial-and-error experiments. While the photoluminescence quantum yield can serve as a first indicator to find best performing host-guest ratio, this quantity does not consider impact of latter charge transport in full device. Herein, we analyse four thermally activated delayed fluorescence OLEDs with varied ratio emissive layer. These devices were characterized and modelled steady-state, under transient conditions frequency domain. In...
This paper reports wet chemical synthesis of Manganese doped Zinc Sulphide Nanophosphors capped with polyvinyl alcohol (PVA) while varying the concentrations dopant and capping agent to explore optoelectronic microstructural properties. Optical morphological comparative studies reveal strongest room temperature orange luminescence (~591 nm) 10% concentration 2% in ZnS host lattice irregularly spherical nanoparticles formation (~29 nm). Further, structural elemental study sample reveals...
This work demonstrates that triplet-triplet annihilation (TTA) is the predominant mechanism of intrinsic photogeneration charge-carrier pairs via autoionization, in a single-component disordered organic system with no heavy atoms. The findings challenge established beliefs by revealing efficient carrier generation TTA upon excitation near absorption edge. Photocurrent measurements, optical spectroscopy, and spin-sensitive techniques support this model bimolecular charge generation. Such...
In this work we showcase the emitter DICzTRZ in which employed a twin-emitter design of our previously reported material, ICzTRZ . This new system presented red-shifted emission at 488 nm compared to that 475 and showed comparable photoluminescence quantum yield 57.1% 20 wt % CzSi film versus 63.3% for The was then incorporated within solution-processed organic light-emitting diode maximum external efficiency 8.4%, with Commission Internationale de l’Éclairage coordinate (0.22, 0.47), 1 mA cm −2
Thermally activated delayed fluorescence (TADF) compounds are highly attractive as sensitizing and emitting materials for organic light-emitting diodes (OLEDs). The efficiency of the OLED depends on multiple parameters, most which rely properties emitter including those that govern internal quantum outcoupling efficiencies. Herein, we investigate a series aryl substituted acridine donor derivatives donor–acceptor TADF DMAC-TRZ, with objective correlating their properties, such triplet...
In this work we showcase the emitter DICzTRZ in which employed a twin-emitter design of our previously reported material, ICzTRZ. This new system presented red-shifted emission at 488 nm compared to that ICzTRZ 475 and showed comparable photoluminescence quantum yield 57.1% 20 wt% CzSi film versus 63.3% for The was then incorporated within solution-processed organic light-emitting diode maximum external efficiency 8%, with Commision Internationale de l’Éclairage coordinate (0.21, 0.47), 10 cd m−2.
In this work we showcase the emitter DICzTRZ in which employed a twin-emitter design of our previously reported material, ICzTRZ. This new system presented red-shifted emission at 488 nm compared to that ICzTRZ 475 and showed comparable photoluminescence quantum yield 57.1% 20 wt% CzSi film versus 63.3% for The was then incorporated within solution-processed organic light-emitting diode maximum external efficiency 8%, with Commision Internationale de l’Éclairage coordinate (0.21, 0.47), 10 cd m−2.